[HECnet] Task Buillder question

[Steve Davidson]

When I was a DEC OEM we used RT-11 and LDA format to load our custom “OS”.  It was my first real project as a system developer. Made good money in those days... 😊

-Steve Davidson

SF:iP1

> On Apr 12, 2021, at 16:17, Paul Koning <paulkoning at comcast.net> wrote:
> 
> 
> 
>> On Apr 12, 2021, at 4:09 PM, Johnny Billquist <bqt at softjar.se> wrote:
>> 
>> Right.
>> When someone talks about the paper tape system, and absolute loader format, it is without any operating system underneath. It's just bare metal. And the absolute loader is just a simple format that can be read by a small program that you have in memory. It's only purpose is to read in a paper tape with the binary on it, and start that.
>> 
>> So there are no system dependecies, there are no addressing issues. It's just actual bytes that will be written to specific addresses in memory, and then a jump to an address, and off it goes.
>> 
>> Johnny
> 
> BTW, SimH can load abs loader format files directly (with the "load" command).  So you don't even need to feed it the abs loader to execute such programs.
> 
>    paul
> 
>